/*
 * Copyright (c) 2012-2017 Red Hat, Inc.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Red Hat, Inc. - initial API and implementation
 */
package org.eclipse.che.plugin.jsonexample.ide.editor;

import com.google.gwt.http.client.Response;
import com.google.gwt.json.client.JSONArray;
import com.google.gwt.json.client.JSONParser;
import com.google.gwt.json.client.JSONString;
import com.google.gwt.json.client.JSONValue;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.eclipse.che.ide.commons.exception.UnmarshallerException;
import org.eclipse.che.ide.rest.Unmarshallable;

/** Deserializer for list of strings. */
public class StringListUnmarshaller implements Unmarshallable<List<String>> {

  private List<String> payload;

  public List<String> toList(String jsonStr) {

    JSONValue parsed = JSONParser.parseStrict(jsonStr);
    JSONArray jsonArray = parsed.isArray();

    if (jsonArray == null) {
      return Collections.emptyList();
    }

    List<String> list = new ArrayList<>();
    for (int i = 0; i < jsonArray.size(); i++) {
      JSONValue jsonValue = jsonArray.get(i);
      JSONString jsonString = jsonValue.isString();
      String stringValue = (jsonString == null) ? jsonValue.toString() : jsonString.stringValue();
      list.add(stringValue);
    }

    return list;
  }

  @Override
  public void unmarshal(Response response) throws UnmarshallerException {
    payload = toList(response.getText());
  }

  @Override
  public List<String> getPayload() {
    return payload;
  }
}
